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Theoretical results on a conventional approach to the dark energy (DE)concept are reviewed and discussed. According to them, there is absolutely noneed for a novel DE component in the Universe, provided that the associatedmatter-energy content is represented by a perfect fluid whose volume elementsperform polytropic flows. When the thermodynamic energy of this fluid'sinternal motions is also considered as a source of the universal gravitationalfield, it compensates the DE needed to compromise spatial flatness in anaccelerating Universe. The cosmological model with matter-energy content in theform of a polytropic fluid not only interprets the observations associated tothe recent history of Universe expansion, but successfully confronts with allthe current cosmological issues, thus arising as a viable alternative to$\Lm$CDM model.

The dark energy as a natural property of cosmic polytropes -- A tutorial